Mixed martial arts is one of the world's fastest growing sports, and Sin City Fight Club brings the action to town in its SHOWDOWN AT CENTER STAGE, a night of Vegas-style partying and extreme cage fighting. The raw and heart-pounding MMA battling will have 12 bouts of professional and amateur MMA, including fighters Dymond Jones, Clint Hester, and other hard-hitters from the United States and Brazil. The night also showcases martial arts organizations such as Unit 2 Fitness, Knuckle Up and X3 Sports. $30-$55. 6:30 p.m. Center Stage, 1374 W. Peachtree St. 404-906-9828. www.sincityfightclub.com.